[LU-2281] tunefs.lustre can segfault on reading malformed ost

• Type: Bug
• Resolution: Fixed
• Priority: Blocker
• Fix Version/s: Lustre 2.4.0
• Affects Version/s: Lustre 2.3.0
• Severity: 3
• Assignee: Nathaniel Clark
• Reporter: Nathaniel Clark

Description

If ldiskfs_read_ldd() cannot read mountdata file, it will segfault on trying to fclose() a NULL file pointer.

Found this while fixing LU-2191